Revolving door



Aug. 11, 1936. E. PEREMI ET'AL REVOLVING DOOR Filed Feb. 10, 1932 10 Sheets-Sheet 1 l NVE NTORS fDMU/VD PEREM/ (HA/91.58 MSH BY THEIR ATTORNEYS Aug. 11, 1936. E. PEREMI ET AL 2,050,584

REVOLVING DOOR Filed Feb. 10, 1952 10 Shee1 ;s-Sheet 2 INVENTORS fan/4 9 PEREM/ (HA/e455 AASH BY THEIR ATTORNEYS mq m Aug. 11, 1936.

E. PEREMI ET AL REVOLVING DOOR 1O Sheets-Sheet 3 Filed Feb. 10, 1952 &I-I

' INVENTORS fONl/IVD Fk/PEM/ CHARLES /|/s/1 BY THEIR ATTORNEYS Aug. 11, 1936.

Filed Feb. 10, 1952 10 Sheets-Sheet 4 INVENTORS foMuxvo PE/Ff/V/ 001K253 K/sh' BY THEIR ATTORNEYS Aug. 11, 1936. E. PEREMI ET AL REVOLVING DOOR Filed Feb. 10, 1932 10 Sheets$heet 5 CHARLES K/SH Y THEIR ATTORNEYS Aug. 11, 1936. E. PEREMI ET AL 2,050,584

REVOLV ING DOOR Filed Feb. 10, 1932 10 Sheets-Sheet 6 INVENTORS fo/vu/vo PERL-Ml (H/W456 Maw BY THEIR ATTORNEYS Aug. 11, 1936. E. PEREMI ET AL REVOLVING DOOR Filed Feb. 10, 1952 10 Sheets-Sheet 8 s m H R e a o & K m 5 2 E w w v u R N m a A? w H m r l m 0 4 a v na/Jh a 3 w M 4 w 2. z y m Wu Mm //J 5 w.

5 I W T 4,

a Q IN 1 m a 0 W 0 5 3 v 2 WW W 8 2 my m 2 Z w 2 u n J Z w 7 g z m BY THEIR ATTORNEYS Aug. 11, 1936.

E. PEREMI ET AL 2,050,584

REVOLVING DOOR Filed Feb. 10, 19:52 10 Sheets-Sheet 1o BY THEIR ATTORNEYS Patented Aug. 11, 1936 UNIED STATES PATENT OFFEQE REVOLVING DOOR poration of New York Application February 10, 1932, Serial No. 592,004

33 Claims.

This invention relates to revolving doors and has for an object the provision of improved means for mounting the leaves. of the door so that said leaves may be collapsed in case of emergency to permit free access .through the door, or may be folded up so as to permit the door to be moved to one side of its enclosure. More particularly means are provided for pivotally supporting the leaves in such a manner that they cannot sag or get out of alignment with respect to the central column of the door, either when arranged in operative radial position or when folded. Another object of the invention is the provision of improved means ior releasably securing the chains 13 which connect the several leaves so as to hold the leaves in spaced radial position during operation of the door, but which permit of the collapse or the door in case of emergency. Another object of the invention is to provide means for governing the speed of rotation of the door so as to make it impossible for the door to be rotated at a dangerous or excessive speed. Other objects and advantages of the invention will appear from the following description of certain preferred embodiments thereof, chosen to illustrate the principle of the invention.

In the accompanying drawings which illustrate such preferred embodiments:

Figure 1 is a front elevation of the door showing the door enclosure in section;

Figure 2 is a plan view of the door with the ceiling and parts above omitted and showing the door enclosure in horizontal section;

Figure 3 is a central vertical section through :33 the door supporting column and the hinge connections by which the leaves are pivotally mounted on such column, portions of the leaves being shown in elevation;

Figure 4 is a horizontal section on line 4-4 of .1; Figure 3;

Figure 5 is a top plan view of the parts shown in Figure 3 showing the door leaves folded;

Figure 6 is a central vertical section through the door supporting column and top hinge con- .3 nections of the leaves of a modified construction .3 door when in radial operative position and partly in elevation, showing the closure sleeve for closing the openings through the outer tube of the door column in the construction shown in Figures 6 and 7.

Figure 9 is a. horizontal section on line 99 of 5 Figure '7, showing the door leaves folded.

Figure 10 is a horizontal section on line l0lll of Figure 6, showing the door leaves folded- Figure 11 is a section similar to Fig. 10 showing the door leaves in radial position.

Figure 12 is a horizontal section on line l2-I2 of Figure 6.

Figure 13 is a detail view in vertical section showing a door leaf chain fitting comprising releasable means for holding one of the panic chains which may be used to hold or assist in holding the door leaves in spaced radial position.

Figures 14, 15 and 16 are horizontal sectional views taken on lines l4l4, |5l5 and |6l6 respectively of Figure 13.

Figure 17 is a view in side elevation of a modified form of panic-chain fitting showing the cover plate removed.

Figures 18 and 19 are sections on lines l8l8 and lQ-l 9 respectively of Figure 1'7.

Figure 20 is a plan view showing a door trolley with a governor mounted therein.

Figure 21 is a central, transverse, vertical section of the trolley and governor mechanism shown in Figure 20, parts being shown in elevation.

Figure 22 is a plan view showing a modified form of governor mounted on a door trolley, the cover plate of the governor mechanism being removed.

Figure 23 is a transverse section taken on line 23-43 of Figure 22.

Figure 24 is a detail vertical section taken on line 24-44 of Figure 22.

Figure 25 is a view partly in side elevation and partly in vertical section of another modified form of governor mounted on the door trolley.

Referring to the drawings in detail, the door enclosure consists of curved side walls 30, ceil ing and the floor 32 of the building. The door comprises a central column 33 on which are pivotally mounted the leaves 34. The door is supported so that the column and leaves may rotate within the door enclosure, the column pref- 'erably being suspended by means of anti-friction bearings from the trolley 40 which is mounted to travel on a track 4| supported above the ceiling 3|. The ceiling 3| is provided with slot 42 through which the column passes, and the bottom of the column is provided with a retractable pivot pin 43 adapted to be received in a sock et 44 located centrally of the door enclosure. A second socket 45 is preferably provided near the side of the door enclosure to receive the pivot 43 when the door is folded and moved to one side, as shown in dotted lines in Figure 2. At one end of the track 4i and also near its center is preferably mounted a latch mechanism 45 for holding the trolley at one or the other limit of its movement. The leaves are provided with suitable weather stripping i'i so as to make a weather proof fit with the door enclosure walls, ceiling and door.

Referring particularly to Figures 3, 4 and 5, these figures show a preferred construction for pivot-ally supporting the door leaves on the central column. Two hinge connections between the leaves and column are preferably provided, one located near the upper part of the door, and one near the lower part of the door. For this purpose, each of the leaves is provided with a hinge fitting which is fixed in the body of the leaf. The door column comprises a strong tube 5| which is suspended from the trolley, and mounted near the upper end of this tube and firmly attached thereto is a sleeve 52 which has four arms 53 projecting therefrom in the form of a cross, each arm being provided with a radial slot 54. Similarly mounted near the lower end of the tube 5| isanother'sleeve 52 having arms 53 provided with slots 54. Also fixed to the tube 5! atsuitable distances from the sleeves 52 are collars 55, each of which is provided with a flange 56. A thin walled metal tube 51 is preferably fitted over these flanges 55 so as to provide a finish for the visible portion of the door column. Mounted on the tube 5| between the collars 55 and the sleeves 52 are a series of flanged bushings which fit end to end and fill the spaces between the sleeves and collars at the top and bottom of the door, respectively. Mounted on "eachof the flanged bushings 60 near the top of the door, are hinge arms or'links'65, one for each door leaf. Similar but inverted hinge arms or links 66 are mounted-on the flanged bushings near the bottomof the door. Each of the hinge arms is provided with a body ring 61 encircling the bushing, and the hinge arms for the'difter- 'ent leaves are offset more or less, as clearly shown -'in Figure 3, so that the arm portions which engage the'door leaves *lie in the same plane. As -will'be evident, one of the four hinge arms is not offset, but lies in the same plane asits body ring. The body rings 61 are of slightly less thickness than the height, of the flanged bushings 55, so that slight clearance is allowed between the adjacent body rings, as indicated'at68. Each hinge arm is pivotally connected'with tits door leaf by means of a pivot pin I0. These pivot pins are preferably cylindrical and are "mounted to turn 'in-opem'ngs H 'in'the door'hinge fittings'50. Each pin-issecured in a hole in a hinge arm by means of 'a set screw 12, and the pins may be readily removed to permitdismounting of the door leaves by loosening the'set screws. Owing to the form of the door hinge fittings, it will be seen that a long bearing is provided for each pivot pin, at each side of the arm to which it is attached, giving strength and durability. The construction described provides .a double pivotal connection between each leaf and the central column, as the leaves may pivot with respect to the arms and the arms are rotatably 'mounted upon the column. This permits -the door leaves to be closely collapsed or folded together. The leaves may all be folded into parallelism so as to prorib which is adapted to be received in a groove --B'l-when-the leaf is in radial position. The depth and inclination of the walls of the groove are .such that the rib 80 may rock into and out of thegroove as'the leaf is moved to radial position or collapsed. At the top and bottom of the door the grooves 8| are formed in the sleeves 52, while between the hinge fittings the grooves are formed in the sleeve 51. Any other suitable formation of the edges of the door leaves and column may o .ibe utilized which will provide weather tight 'joints.

While the links or hinge arms 55 and 63 support :the door leaves and permit the necessary pivotal movement thereof, there is'dangerof the 2 leaves getting-outof alignment when =folded,-especially where heavy metal door leaves are utilized. It willbe seen that each leaf is supported by a single link at the top and another link at the bottom, each of which links or hinge arms has a pivotalconnection at each end. Any play or 'looseness of these pivotal connections, such as must inevitably be present, or any straining of the links or -of the pivotal supports, makes 'it possible for the top and bottom of the leaf to get outof alignment with consequent jamming of the-parts, or excessive friction, interfering with the proper folding of the leaf. In order-to overcome this -difiiculty, it is important to provide means which will effectually maintain "the proper vertical alignment between the top and bottom of each leaf during its pivotal movement. In the construction shown, the means provided .for this purpose comprises the slotted cross-arms 53 already described, one of which is mounted near the top and one near the bottom of the door. Each door leaf is provided with guide pins mounted in the hinge fittings 50 at the top .and bottom of the leaf, which:pins slide in'the corresponding slots 54 in the cross-arms 53. As the sleeves 52 and cross-arms53 are fixed with relation to one another, it willbe seen thatthe slots 54 will properly guide the pins 85, and therefore the tops and bottoms of the leaves are always in true vertical alignment. The engagement of the pins in the fixed guide slots also constrains the leaves and links to movement in determinate paths .when the leaves are folded.

In order 'to enable the leaves to -be folded closely without interference from theends of the arms, recesses areprovided .in extension ,portions of the hinge fittings 50 into which ,theends of the cross-arms may project, .as will appear from Figure 5. To prevent the passage of drafts through the recesses .95, the recesses .are .closed by flaps 9| mounted on springhinges 92 (Fig. 3).

Forretaining the ,leavesin radial positiomeach leaf is preferably provided at .top and .bottom with a spring pressed bullet catch 94 .adapted to engage in the corresponding slot .511 when the door leaf reaches the radial position. .On the application of sufficient pressure tothe leaf, these catches will vbe forcedinto retracted position and permit the door leaf tofold. Additional .means for retaining the door leaves in radial operative position are preferably provided, such as the releasable panic chains 99 (Fig. l), which may be of any suitable construction, such for instance as one of the constructions illustrated in Figures 13 to 19 which will be more particularly described hereafter.

Figures 6 to 12 show a modified construction of door. I03 is the central tubular support for the door which is rotatably suspended from the trolley 40, and I04 are the door leaves. Mounted on the tube I03 are four collars I05, I06, I01, and I08 (Figs. 6 and 7). Mounted between each pair of collars are four flanged bushings I09 filling the space between the collars, and each preferably secured to the tube by suitable means such as screws IIO. Rotatably mounted on each of the bushings is the body ring I I I of a hinge arm or link II2. All of the hinge arms except one are provided with an offset portion II3 so as to bring the laterally projecting parts of the arms into the same plane. Each of the door leaves is provided with hinge fittings H4 at top andbottom to receive the hinge arms. The fittings carry pivots H passing through holes in the hinge arms. The pivots may be lifted in their recesses in the hinge fittings so as to permit the door leaves to be dismounted. In order to secure the pivot pins in either their operative or retracted positions, each pin is provided with a screw IIB passing through a slot II! in the corresponding hinge fitting (Fig. 7). For releasably retaining each leaf in alignment with its hinge arms when the leaves are set in radial position, each hinge fitting is provided with a spring pressed bullet catch II8 adapted to engage in a recess H9 in the corresponding hinge arm.

The mounting of the leaves upon the hinge arms with the pivotal connections between each leaf and its hinge arms and. the rotative movement of the hinge arms about the central shaft permit the leaves to be folded into desired position, either with all four leaves parallel, as shown in Figures 9 and 10, or with the leaves folded two and two and extending in opposite directions from the column. As pointed out in connection with the construction previously described, however, leaves pivoted merely on the hinge arms in this manner may get out of alignment in such a way as to sag or jam and prevent proper operation of the parts. In the present construction means are provided for positively maintaining the alignment of the top and bottom hinge arms for each leaf, and thus maintaining the leaves in truly vertical position at all times. This is accomplished by connecting corresponding upper and lower hinge arms by means of rigid bars I (Figs. 6, 7 and 9). These bars are of sufiiciently heavy cross-section to resist any torsional stresses to which they may be subjected, and they are anchored to their corresponding hinge arms in a mannerto resist relative turning between the arms and the bars; For instance, as shown the arms are provided with tongues I2I which fit into grooves in the ends of the bars, the bars and arms being clamped together by cap screws I22. Thus each pair of hinge arms and its connecting bar become in effect a unitary hinge structure for the leaf supported thereby. As a further means for guiding the leaves during their folding movement, a plate I is provided which is attached to the tube I03 preferably adjacent to the top of the door, this plate having four cross-arms I3I provided with slots I32 similar to the slotted cross-arms 53 previously described. In the present construction only one cross-arm plate is provided because of the rigid comiection between each pair of hinge arms. Each of the door leaves is provided with a ide pin I33 working in one of the slots I32. The plate I30 is provided with a neck portion I35 (Figs. '6, 10 and 11), in which are formed four recesses I36 which receive projecting ribs I31 on the edges of the door leaf guide fittings I38. The guide pins I33 are carried in these projecting portions I31. In order to enclose the bars I20 and provide a smooth and attractive finishfor the central door column, and also to provide for a weather tight joint between the leaves and the column, a sleeve I40 is employed which is supported from the tube I03 by a flange I4I mounted just below the guide plate I30 (Fig. 6) and by a flange I42 mounted at the lower end of the column. The sleeve I40 is also supported at suitable points by means of braces I43 (Fig. 9). As the movement of the hinge arms and connecting bars is less than 90,

such cross-braces do not interfere with the proper functioning of the parts. The sleeve 940 is provided with horizontal slots I44 to permit movement of the hinge arms, and in order to close the portions of these slots at each side of the arms when the door leaves are in radially extended operative position, tubular shields I slidingly fitted inside the sleeve I40 are provided (Figs. 6, '7 and 8). The upper shield (Figs. 6

and 8) normally rests on the upper hinge arms and is provided with notches I5I in its lower edge leaving shield projections I52. which extend downwardly between the arms and back of the slot portions in the main sleeve I40 when the arms are in right angular spaced position. Shield I50 is normally held down by springs I53. The walls of slots I5I are curved as shown in Figure 8, and the arms at the point where they engage the slot walls are cut away to provide curved surfaces I54. When the arms are rotated by the folding of the leaves, it will be seen that engagement of these curved surfaces with the inclined walls of the slots will exert a camming action which will push up the shield I50 so as to permit the arms to move. The lower shield I50 is operated in the same way as the upper shield, it being normally urged upward by means of springs I (Fig. 7) which are supported on spring brackets I56 attached to the central tube For actuating the bottom door pivot I60 (Fig. 7) and for operating the latch actuating head I6I at the top of the door (Fig. 6) rods I02 and I63 are provided, connecting these parts respectively with a slide I64 mounted in the tube I03 (Fig. '7). The slide I64 is actuated by means of a stud I65 which projects through bayonet slot I63 in the tube I03, and through a correspondingly placed slot I61 in the sleeve I40. The end of the stud preferably carries a hinged flush bolt I68 which lies in the slot I 6'! when not inuse, but may be pivoted outwardly so as toenable the stud I65 and slide I64 to be moved. The sleeve I40 and the inner edges of the door leaves are provided with suitable means for insuring weather tight joints when the leaves are in operative radial position (Fig. 12). In the construction shown the sleeve I40 is provided with ribs I'I0 which fit corresponding grooves I'II formed in the inner edges of the leaves. When the door leaves are folded, the edges of the leaves rock away from the ribs I10 as shown in Figure 9.

Figures 13 to 16 show a releasable panic chain fastening means which may be applied to either of the door constructions described above. or to any other collapsible revolving door construction in which panic chains may be utilized. Referring to these figures in detail, each door leaf is provided with a housing 209 having a recess 2M therein which is adapted to be closed by a removable cover plate 202. The housing 295 is also provided with a second recess 203 at the front of which is an apertured wall 294 through which passes a bolt 205fastened to one end of the panic chain and secured in the recess 293 by nuts 29%, thus forming a deadend for a panic chain sec tion. Mounted in the recess 29| is a vertical shaft 2l0 which is journaled at its lower end in a bearing in the bottom of the recess and near its upper end in a bearing in a removable plate 2| 1. The upper end of the shaft 2|2 is squared and carries a block 213 having a surface which is cylindrical, except at one side where there is a projection 2| 4 providing a flat side 2E5 .tan gential to the cylindrical surface. The block is also provided with a recess 2 6 for the reception of an operating pin (not shown). The block is adapted to be locked against rotation in one direction by the engagement of the fiat surface 2l5 with a removable plate 2H, but being capa ble of rotation through a part of a turn in the other direction. Fixed to the shaft and to the housing are two coiled springs 220, and by removing the locking plate 2|! and rotating the shaft these springs may be given any desired tension which will be maintained by replacing the locking plate so as to engage the fiat side of the block as described. The block is so arranged as to prevent the rotation of the shaft in a direction to release the tension of the springs, but will permit the partial rotation of the shaft in a direction to increase such tension. Fixed to the shaft 2 l9 between the springs 29% is a star wheel 222. The free end of each chain section 99 is provided with a head 225 which carries a tooth 226 adapted to engage between two of the star wheel teeth, the length of the chain being preferably so adjusted that the tooth 225 will hold the star wheel, shaft 2!?) and block 2i3 in such a position that the fiat face 265 is out of contact with the plate 2 I! as shown in Figure 16. It will be seen that the tensioned springs tend to rotate the shaft and star wheel in a counterclockwise direction (Fig. 14), and thereby to draw the head 225 into the recess in the housing, so as to maintain the chain 99 taut. However, upon the application of suificient force to the chain 99, as would be caused by substantial pressure applied to the door leaf to which the other end of the chain section is attached, the star wheel will yield sufliciently to release the tooth 225, and thereby release the chain and attached door leaf. The star wheel is provided with sockets 22'! which may be engaged by pins, so as to rotate the shaft and place the springs 229 under the desired initial tension.

Figures 17 to 19 show another construction for releasably holding the end of a panic-chain section. As here shown, each door leaf is provided with a housing 249 in which is a recess 24! covered by a cover plate 242. Each housing is provided with means for holding the dead end of one chain section and with releasable means for engaging the free end .of another chain section. For the latter purpose a latch block 243 is mounted in the recess 24! (Fig. 18), and is provided with a lug 244 adapted to engage with the diamond shaped head 245 fixed to the free end of the chain section 99. Pivoted in .a slot 246 in thehousing by a pivot 24'! is a latch 248 which has a nose 249 adapted to engage with the diamond shaped head 245 on the chain, and to releasably retain such head in the housing in cooperation with the lug 244. The pivoted latch 248 is normally held with the nose advanced by means of a coiled compression spring 250. The pivoted latch 248 is also provided with a finger piece 25l by which it may be swung about its pivot so as to move the nose 249 away from the head 245 when it is desired to manually release the chain. The latch block 243 is urged towards the head 245 and normally held in its advanced position in contact with a fixed stop 255 by means of an adjustable screw 256 which is carried by a lever 25'! pivoted at one end upon a fixed pivot 25%. The other end of the lever is constantly urged towards the right (Fig. 17), by means of a strong coiled tension spring 259, one end of which is connected to the lever and the other end to a fixed pin 269. With the parts in the position shown in Figure 18, itwill be seen that tension applied to the chain section 99 will cause the diamond shaped head245 to engage the nose 249 on the pivoted latch 248. As the nose projects beyond the pivot 24? at this time, the tension will not release this pivoted latch, but will hold it firmly in the position shown. Increased tension on the chain section will, however, cause the diamond shaped head 245 to force the lug 244 and block 243 to the left against the tension of spring 259 and thereby release the chain. If it is desired to manually release the chain, it is not necessary to apply this degree of force to the chain, as the application of light pressure to the finger piece 251 will rotate the latch 248 so as to free the chain 99 without the application of any substantial force thereto. Preferably the spring supported block 243 which carries the chain engaging abutment 244, which is adapted to yield to release the chain in case of panic, is located nearer to the outer edge of the door leaf than is the abutment 249 which does not yield to a pull on the chain. As the chain makes an angle of 45 with the door leaf it will be seen that the force of the pull of the chain falls more heavily on the relatively fixed abutment 249 than on the yielding abutment 244. Accordingly the yielding force of the spring 259 necessary to hold the abutment 244 in place is less than in constructions where the yielding abutment is located on the side of the chain nearest the center of the door. A light spring may accordingly be used.

In order to provide governing means for preventing the door from being revolved at excessive speed, a suitable governor construction may be applied to the door. A governor construction which may be utilized for this purpose is illustrated in Figures 1, 20 and 21. In the construction here illustrated, a type of centrifugal governor is employed which is carried on a bracket 280 attached to the trolley 49. The governor comprises a housing 23! fixed to the bracket and having four downwardly and inwardly extending wall portions 282 united at the bottom and carrying a bearing 283. Mounted on top of the housing is a spider 284 carrying an upper bearing 285. Rotatably mounted in these bearings is a vertical shaft 286 which has a pinion 28? fixed to its lower end, which is in constant mesh with a gear 288 fixed to the rotatable column 33 of the door. The shaft 286 has fixed to it a collar 299 which carries two projecting slotted arms 29f. Passing through the slots in these arms, and pivoted on pivots 292 carried by the collar, are a pair of bell crank levers 293 carrying weights 294 at their lower ends. Also carried by the collar 29 are two arms 295 projecting at right angles to the arms 29 I. Carried in the ends of the arms 295 are brake shoe pivots 296 on each of which is pivoted a pair of brake shoes 29! which are adapted to be forced into engagement with the fixed brake drum 298 carried by the housing 23!. The free ends of the brake shoes 29'! are operatively connected with the upper arms of the bell crank levers 293 by means of bell cranks 333 pivoted upon pins 30! carried by the arms 29 I, the overlapping ends of the bell cranks being pivoted to yokes 332 by means of pivot pins 33. These yokes are connected to the upper ends of the bell crank levers 293 by means of adjustable links 333. When the speed of rotation of the door, which is transmitted to the shaft 235, reaches the maximum desired, the outward movement of the weights 294 will cause the brake shoes to be applied and thereby retard the speed of the door.

In Figures 22, 23 and 24 a modified form of governor is illustrated in which a brake drum 3H3 is mounted on the door trolley by means of brackets 3| the top of the drum being closed by a cover 3!2. Mounted in bearings in the drum and cover is a vertical shaft M3 on the lower end of which is fixed a pinion 3 !4 which meshes with the gear 3!5 fixed to the upper end of the door column 33. Mounted on the shaft 3E3 within the brake drum is a spider 3253 having two arms 32!, to each of which is pivoted a brake shoe 322. The spider 32!} has two other arms 325 projecting at right angles to the arms 32!, each of these arms having a dove-tail or otherwise suitable shaped guide 326 at the top thereof on which is slidably mounted a Weight 321 adapted to engage one of the brake shoes. Each of the arms 325 is also provided with an upwardly pro jecting lug 328, and each of the weights has a groove 329 in its upper surface. A pin 33!] is attached to each brake shoe and passes through the groove in the top of the corresponding weight and through a hole in the corresponding lug 328. Mounted on the inner end of each pin is a coiled compression spring 33! which is retained in position by adjustable nuts 332. Also mounted on each pin is a stop collar 333, adapted to engage the corresponding lug 328 and limit the inward movement of the pin. The rotation of the door will'rotate the column 33 which will drive the vertical shaft 3!3 through the gearing described and thus rotate the spider 320 and the weights and brake shoes carried thereby. The centrifugal force of the weights will overcome the resistance of the springs 33! and will cause the brake shoes to be applied to the inner vertical wall of the brake drum 3I0. By adjusting the nuts 332, the resistance of the springs 33l can be adjusted so that the braking force will be applied at the proper speed to check the motion of the door. The construction described is very compact and, as will be seen, the brake drum is mounted above the trolley and tracks and very little lateral space is required to receive it. By mounting the gear 3l5 on the upper end of the door column above the trolley, no space is required to be left between the trolley tracks and the ceiling for the reception of this gear, but the tracks may be seated directly upon the ceiling if desired.

In Figure another form of governor is shown comprising a frame 34!] mounted on the door trolley and carrying a vertical shaft 34! which has fixed to its lower end a pinion 342 meshing with a gear 343 on the upper end of the door column 33. Adjustably mounted on a table 345 on top of the bracket 34!] by means of studs 346 and nuts 34! is .a conical drum 348 carrying a conical brake band 349. Slidingly mounted on the shaft 34! is a sleeve 35!] which is caused to rotate with the shaft by means of 5 a pin 35! working in grooves 352 in the sleeve. The sleeve carries at its lower end a conical brake shoe 353 which is adapted tobe brought into en-' gagement with the conical brake band 349 by means of two levers 355 carrying weights 356 and 10 pivoted by pivots 357 to a collar 358 fixed to the upper end of the shaft 34!. Links 359 connect the levers 355 with the sleeve 350.

While we have illustrated and described in detail certain preferred forms, of our invention, 15. it is to be understood that changes may be made therein and the invention embodied in other structures. We do not, therefore, desire to limit ourselves to the specific constructions illustrated, but intend to cover our invention broadly in whatever form its principle may be utilized.

We claim:

i. In a revolving door, a central supporting column, a plurality of door leaves supported on said column in such manner that they may be fixed in radial position or collapsed, the means for so mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted to the respective leaves, a guide plate fixed to said column and having a plurality of guides ways therein, and a guide member on each leaf travelling along one of said guideways and cooperating with the hinge arms carrying said leaf to constrain said leaf to move in a predetermined path when folded to collapse said door.

2. In a revolving door, a central supporting column, a plurality of door leaves supported on said column in such manner that they may be fixed in radial position'or collapsed, the means for so mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted to the respective leaves, a guide plate fixed to said column having radial guideways therein, and a guide member on each leaf travelling in one of said guideways to guide the leaf during folding to collapse said door.

3. In a revolving door, a central supporting column, a plurality of door leaves supported on said column in such manner that they may be fixed in radial position 'or collapsed, the means for so mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted to the respective leaves, a guide plate fixed to said column having radial guideways therein, a pin on each leaf travelling in one of said guideways to guide the leaf during folding to collapse said door, and means for maintaining the hinge arms for each door leaf in alignment during folding 4. In a revolving door, a central supporting column, a plurality of door leaves supported on said 60 column in such manner that they may be fixed in radial position or collapsed, the means for so mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted to the respective leaves, guide plates fixed to said 65 column near the ends thereof and having aligned guideways therein, each of said leaves having a pair of pins travelling respectively in a pair of said aligned guideways for maintaining the proper vertical alignment of said leaves during folding 70 to collapse said door. V

5. In a revolving door,'a central supporting column, a plurality of door leaves supported on said column in such manner that they may be fixed in radialposition or, collapsed, the means for so 7 mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted" to the respective leaves, a cross-shaped guide plate fixed to said column having radial guide slots in the cross-arms thereof, a guide pin on eachleaf travelling in one of said slots and a recess in each leaf adapted to receive the end of a cross-arm when the leaf is folded.

6. In a revolving door, a central supporting column, a plurality of door leaves, hinge arms pivotally mounted. on said column and pivoted to the respective leaves, a cross-shaped guide plate fixed to said column having radial guide slots in the cross-armsthereof, a guide pin on each leaf travelling. in one of said slots and a recess-in each leaf adapted. to receive the end of a cross-arm when the leaf is folded, and yielding flaps for closing. said recesses.

7. In a revolving door, a central column, a plurality of door leaves supported on said column in such manner that they maybe fixed in radial position or collapsed, the means for so'mounting the leaves comprising upper and lower groups of hinge arms pivotally mounted on said column, one of said doorleavesbeing mountedon each pair of hinge arms, vertical bars rigidly connecting each pair of hinge arms to maintain the same in alignment, and guidemeans for constraining said leavesto move in predetermined paths while being folded.

8. In a revolving'door, a central column, upper and lower groups of hinge arms pivotally mounted on said-column, door leaves-mounted on each pair of hinge arms, vertical bars rig-idly connecting each pair of hinge arms to maintain the same in alignment, a guide plate-fixed to said column, guidewaysin said plate and pins carried by portions of said leavesnearer to-saidcolumn-than the pivotal connections between said leaves and the hinge arms when saidleaves are-in-radial position, one of saidpins travelling in each of said guideways.

9. In a revolvingdoor, a central column, upper and lower groups-of hinge-arms pivotally mounted'on'said column, door leavesmountedon each pair of hinge arms, vertical barsrigidly connecting each pair of hinge arms to maintain the same in-alignment, and a sleeve carried by said central columnenclosing said'verticalbars.

10. In arevolving door, a central column; up-' per and lower groups of hinge arms pivotally mounted on said column, door leaves mounted on each pair ofhingearms, vertical bars rigidly connecting each pair of hinge arms-to maintain the same in alignment; and a sleeve carried by said central column-enclosing saidvertical bars, said sleeve being slotted for" passage of said hinge arms and shields for closing-said-slots at each side of-said hingearms when thedoor leaves are'set in radial position,

11 In a revolving door, acentral column, upper andlower groups of hinge armspivotally mounted on said column, door leaves mounted on' eachpair of hinge arms, vertical bars rigidly connecting eachpair of hinge arms to maintain the samein alignment, anda sleeve carried bysaid' central column enclosing said vertical bars, said sleeve being slotted for passage of said hinge arms and shields for closing said slots ateach side ofsaidhinge arms when-the door leaves are set in radial position, said shieldseachcomprising a tubular member supported uponsprings and having notches in one end adapted'to receive saidhinge-arms, said-arms and notches having inclined engaging surfaces whereby,- when said arms are moved from. radial position, they will force said shield into retracted position.

12. In a revolvingdoor, a central supporting column, a plurality of door leaves supported on said column insuch manner that they may be fixed in radial position or collapsed, the means for so mounting the leaves comprising hinge arms pivotally mounted on said column and pivoted to the respective leaves, a guide plate fixed to said column having radial guideways therein, and a guide member on each leaf travelling in one of said guideways to guide the leaf during folding, and bullet catches on the leaves adapted to engage in said guideways when the leaves are in radial position.

13. In a revolving door, a central supporting column, a plurality of bearing bushings mounted thereon, a plurality of hinge arms each having a ring portion surrounding and pivotally mounted and supported upon one of said bearing bushings independently of the adjacent hinge arms and door leaves-pivotally attachedto said hinge arms.

14. In arevolving door, a central supporting column, groups of flanged bearing bushings mounted near the upper and lower ends of said column, aplurality of hinge arms each having a ring portion surrounding one of said bearing bushings and supported by the flange thereof out of contact with the adjacent ring portions, and doorleaves pivotally mounted upon pairs of said hinge arms.

15. In a revolving door, a panic chain construction comprising a chain, a fitting mounted in a door leaf, a shaft mounted in said fitting, a rotatable chain engaging-latch member mounted onsaid shaft and within the leafand adapted to release the chain by a partial rotation, a spring for yieldingly-resisting the rotation of said latch member so as-to-releasably hold said latch memher in engagement with the chain, and means accessible from the'exterior of'the leaf for turning said. latch withinthe leaf to a releasing position, whereby the chain may be released without tensioning the chain.

16. Ina revolving door, a panic chain construction-comprising a fitting mounted on a door leaf, a vertical shaft rotatably mounted in said fitting, a starwheel mounted on said shaft, a coiled spring fixed atone endto said shaft and at theother end tosaid fitting and adapted to yieldingly resist-therotation of said shaft, and a chain section having'an end piece adapted to be releasably engaged-'bythe teeth of said star wheel.

17. In a revolving door, apanic chain construction comprising a'fitting mounted on a door leaf, a vertical shaft rotatably mounted in said fitting, astar wheel mounted on said shaft, a coiled spring fixed at' oneend to said shaft and at the other end'to-said fitting and adapted to yieldingly resist the rotation of said shaft, a chain section having an end piece adapted to be releasably engaged bythe teeth of said star wheel, and means for adjusting the tension of said spring. (55

18; In a revolving door, a panic chain constructioncomprising-afitting mounted on a door leaf, a=vertical shaft rotatably mountedin'said fitting, a-star wheelmounted' on said shaft, a coiled spring fixed atone end-to said shaft and at the otherend to said-fitting and adapted to yieldingly resist the--rotation of' said shaft, said shaft carrying a blockhaving a stop surface thereon limiting rotationofsaid shaft in=one direction butpermitting-partial rotation thereof a direction to increase the tension of said spring, and a chain section having an end piece adapted to be releasably engaged by the teeth of said star wheel.

19. In a revolving door, a panic chain construction comprising a fitting mounted in a door leaf, a chainsection, and a pair of clamping members in said fitting for engaging the end of said chain section, means for operating one of said members manually to release said chain section and means for yieldably holding the other of said members in engagement with said chain section, said means permitting said member to move and release said chain section on the application of a predetermined force.

20. In a revolving door, a panic chain construction comprising a fitting mounted in a door leaf, a chain section, and a pair of clamping members in said fitting for engagirg the end of said chain section, one of said members being pivotally mounted and being provided with means whereby it may be manually moved about its pivot to disengage said chain section and the other of said members being yieldingly supported in engagement with the end of said chain section by means permitting said member to yield and release said chain section upon the application of apredetermined force thereto.

21. In a revolving door,,a panic chain construction comprising a fitting mounted in a door leaf, a chain section, and a pair of clamping members insaidfitting for engaging the end of said chain section, one of said members being pivotally mounted and being provided with means whereby it may be manually moved about its pivot to disengage. said chain section and the other of said members comprising a block mounted to slide in a recess in said door fitting, and yieldable means for holding said block in engagement with the end of said chain section, said yiel-dable means comprising a pivoted lever and a spring for holding said lever in engagement with said block.

22. In a revolving door, a trolley, a door column rotatably suspended therefrom and carrying door leaves, a bracket carried by said trolley, a fixed braking member carried by said bracket, a rotatable member carried by said bracket, means for driving said rotatable member from said door column, brake shoe means carried by said rotatable member, and centrifugal means for causing said brake shoe means to be engaged with said fixed braking member on the rotation of said door at excessive speed.

23. In a revolving door, a trolley, a door column rotatably suspended therefrom and carrying door leaves, a. bracket carried by said trolley, a fixed braking member carried by said bracket, a rotatable member carried by said bracket, means for driving said rotatable member from said door column, including a gear fixed to said door column above said trolley, brake shoe means carried by said rotatable member, and centrifugal means for causing said brake shoe means to be engaged with said fixed braking member on the rotation of said door at excessive speed.

24. In a revolving door, a trolley, a door column rotatably supported thereby, a bracket on said trolley, a housing carried by said bracket, a brake drum carried by said housing, a veritcal shaft rotatably mounted in said housing, gearing for driving said vertical shaft from said door column, a spider mounted on said rotatable shaft, brake shoes carried by said spider, and centrifugal means carried by said spider for forcing said brake shoes into engagement with said brake drum.

25. In a revolving door, a trolley, a door column rotatably supported thereby, a bracket on said trolley, a housing carried by said bracket, a brake drum carried by said housing, a vertical shaft rotatably mounted in said housing, gearing for driving said vertical shaft from said door column, a spider mounted on said rotatable shaft, brake shoes carried by said spider, and centrifugal means carried by said spider for forcing said brake shoes into engagement with said brake drum, said centrifugal means comprising weighted bell crank levers carried by said spider and linkage operatively connecting said bell crank levers with said brake shoes.

26. In a revolving door, a trolley, a. door column rotatably supported thereby, a bracket on said trolley, a housing carried by said bracket, a brake drum carried by said housing, a vertical shaft rotatably mounted in said housing, gearing for driving said vertical shaft from said door column, a spider mounted on said rotatable shaft, brake shoes carried by said spider, and centrifugal means carried by said spider for forcing said brake shoes into engagement with said brake drum, said centrifugal means comprising weights engaging said brake shoes and mounted to slide radially on said spider.

27. In a revolving door, a trolley, a door column rotatably supported thereby, a bracket on said trolley, a housing carried by said bracket, a brake drum carried by said housing, a vertical shaft rotatably mounted in said housing, gearing for driving said vertical shaft from said door column, a spider mounted on said rotatable shaft, brake shoes carried by said spider, and centrifugal means carried by said spider for forcing said brake shoes into engagement with said brake drum, said centrifugal means comprising weights engaging said brake shoes and mounted to slide radially on said spider, and adjustable spring means for resisting the outward movement of said weights.

28. In a revolving door, a rotatable door column and a governor therefor comprising a bracket, a vertical shaft mounted therein, gearing for driving said vertical shaft from said door column, a fixed conical brake member carried by said bracket, a sleeve slidably mounted on said shaft, a conical brake shoe carried by said sleeve, and centrifugal means for moving said sleeve longitudinally of said shaft to cause the conical brake shoe thereon to engage with said fixed conical brake member.

29. The combination with a revolving door, of an overhead supporting carriage therefor, a track supporting the carriage, a shaft for said door, an oscillatable support for said shaft and door upon said carriage, a friction speed controlling device mounted wholly as a self-contained unit upon and travelling with said carriage, and driving connections between said shaft and said device, said device being mounted above the track in position to avoid interference with the tilting of said support.

30. The combination with a revolving door, of a shaft therefor, a. carriage supporting the door, and a speed controlling device for said door mounted Wholly as a self-contained unit upon ashaft therefor,.a carriage supporting the door, and a speed controlling device for saidv door mounted wholly as a self-contained unit upon and. travelling with said carriage and door, carriage locking means for retaining the door in normal operating position comprising cooperativelocking parts, one of which is carried by the carriage,. and an unlocking rod extending upward through the door shaft for engaging and releasing one of said locking parts, said controlling device being disposed out of of alignment with the door shaft and in non-interfering relation; to the unlocking rod and the locking parts.

32. The combination with a revolving door having wings, of a shaft therefor, a carriage supporting the door, a speed. controlling device for? said door mounted wholly as a self-contained unit upon and'traveling with said carriage and door, a door enclosure including arcuate side walls and a ceiling having a radial slot therein for accommodating the door shaft, and a carriage supporting track above the ceiling extending in the direction of the radial slot, said door including means collapsibly supporting the doorwings upon the shaft so that the Wings may be folded and then moved withthe shaft to one side of the door enclosure comprising a horizontally disposed drum mountedeccentrically with relation to the door. shaft, and centrifugally controlled friction devices cooperating with said drum, and said speed controlling device being confined so as not to extend a greater distance from the center of the door enclosure in the direction of the radial slot than the wing supporting means extends in that direction, whereby interference by the speed controlling device with the movement of the collapsed door toward one: side ofthe door enclosure-is avoided.

33. The combination with. a revolving door having wings, of a shaft therefor, a carriage sup"- porting the door, a speed controlling device'for said door mounted wholly as aself-contained unit upon and traveling with said carriage and door, a door enclosure including arcuate' side Walls and a ceilingihaving a radial slot therein for accommodating. the door shaft, a carriage supporting track above the ceiling extending in the direction of the radial slot,wsaid-door includ ing meansicollapsibly supporting the door wings upon the shaft so that the Wings may be folded and then moved with the shaft to one side of the'door enclosure, said speed controllingdevice including a horizontally disposed drum eccentrlcally mounted with relation to the door shaft, a vertical shaft concentric with the drum, and a pinion on the vertical shaft, and'gearing including a relatively large driving gear onv the door shaft for driving saidpinion, and centrifugally controlled members driven by the vertical shaft within the drum andcooperating with the drum, said carriage, driving. gear, anddrum be ing all confined and mounted so as not to extend to a greater distance from the center of the door enclosure in the direction of the radial slot than the wing supporting means extends in that direction, whereby interference by the speed controlling device with the movement of the collapsed door toward one side ofthe doorenclosure is avoided.

EDMUND PEREMI. CHARLES HSH. 

